They certainly had a lot of input (not particularly starry-eyed or visionary, btw), accepted by partners who wanted to tie them in. The expectation was that - as had happened before - there would be further moves towards "greater union" in terms of economic governance because everyone, the Germans included, would simply be forced into them by circumstances. But Germany stood by monetarism and moved towards mercantilism, and the whole continent got converted to marketista theology which prevented either right or left governments from reacting to that.